This file photo, taken in 2011, shows a member of the Manila international airport immigration team checking travellers' documents. Philippine airport immigration officials have tightened monitoring of arrivals from Africa after a spate of arrests of drug mules from the continent, according to a spokeswoman

This file photo, taken in 2011, shows a member of the Manila international airport immigration team checking travellers' documents. Philippine airport immigration officials have tightened monitoring of arrivals from Africa after a spate of arrests of drug mules from the continent, according to a spokeswoman